Year | Value | 2022 | 49.007676157984 | 2021 | 49.006163783118 | 2020 | 49.001957699837 | 2019 | 49.000810660102 | 2018 | 49.001422520199 | 2017 | 49.001677076337 | 2016 | 49.001438881821 | 2015 | 49.000052246907 | 2014 | 48.969134812589 | 2013 | 48.905561940674 | 2012 | 48.835696630675 | 2011 | 48.759182587944 | 2010 | 48.705173975595 | 2009 | 48.701878859545 | 2008 | 48.720802702775 | 2007 | 48.736856975245 | 2006 | 48.750608306756 | 2005 | 48.760926553136 | 2004 | 48.757437982894 | 2003 | 48.73214268372 | 2002 | 48.695911235116 | 2001 | 48.657504302907 | 2000 | 48.59977685687 | 1999 | 48.514912034745 | 1998 | 48.43191970157 | 1997 | 48.359204639642 | 1996 | 48.284730935473 | 1995 | 48.208064685447 | 1994 | 48.127590244265 | 1993 | 48.041510150545 | 1992 | 47.947760955972 | 1991 | 47.845804401706 | 1990 | 47.919815962412 | 1989 | 48.171574955896 | 1988 | 48.338983519905 | 1987 | 48.422209725868 | 1986 | 48.496651062297 | 1985 | 48.558221633199 | 1984 | 48.602341768287 | 1983 | 48.623666237931 | 1982 | 48.618251535615 | 1981 | 48.581594147093 | 1980 | 48.64143974688 | 1979 | 48.846818764193 | 1978 | 49.082560768301 | 1977 | 49.317141067126 | 1976 | 49.548757483802 | 1975 | 49.771381343251 | 1974 | 49.877000119876 | 1973 | 49.870641314305 | 1972 | 49.864289024309 | 1971 | 49.856991628735 | 1970 | 49.84829094926 | 1969 | 49.83904219079 | 1968 | 49.829140239671 | 1967 | 49.818380502366 | 1966 | 49.806759822316 | 1965 | 49.793586704422 | 1964 | 49.778617450955 | 1963 | 49.761665753782 | 1962 | 49.744477824399 | 1961 | 49.725722788758 | 1960 | 49.705595499527 |
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